# Confidence Interval of a Proportion Calculator LibreTexts

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CONFIDENCE INTERVAL for proportions Calculator

Fill in the sample size (n), the number of successes ($$x$$), and the confidence level (CL).  Write the confidence level as a decimal.  For example, for a 95% confidence level, enter 0.95  for CL.  Then hit Calculate and assuming $$np$$ and $$nq$$ are large enough, the correct confidence interval will be calculated for you.

 n: $$x$$: CL: Lower Bound Upper Bound $$\hat{p}$$

(Desmos)